The short video features Millie, as Millie Bobby “Blue”, overseeing a global “go blue” operation. Alongside her team of young helpers, Millie calls on fellow UNICEF Goodwill Ambassadors and supporters to join her in going blue – by wearing or displaying the color blue – in support of children’s rights.

“World Children’s Day is a fun day with a serious message. It is a day where all children are encouraged to speak out about what matters to them, like education, safe spaces to learn and play, and positive environments. By going blue for UNICEF on this day, we are demanding the world provide a brighter future for kids,” she says.